Cover for large books



May 18, 1943 M.R.HUL+M1AN Em. 2,319,605

COVER FOR LAl`,L&E BOOKS Filed Jan. '1*2, 1942 ATTORNEYS Patented May18, 1943 COVER FOR LARGE BOOKS Maynard R. Hultman and Cart E. Hultman,Crafton, Pa.

Application January 12, 1942, Serial No. 426,516

2 Claims.

This invention relates to covers for large books, especially publicrecord books, such as deed and mortgage books, but is not limited tothis type alone.

An object of the invention is to provide a cover formed of ply woodrecessed at the rear edge to receive the leaves of the vhinge and clampstrips to cover the leaves, the recesses being stepped so that thestrips are llush with the surfaces of the ply wood cover and thus thebook will be of uniform thickness without projecting edges at the hinge.

A further object is to provide a device of this character in which theuse of ply wood eliminates seasoning after the book is finished and alsowarping of the cover as well as distortion of the cover at the hingewill be positively prevented.

A further object is to provide a device of this character which will beformed of a few strong, simple and durable part-s, which will beinexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in view, the invention consists ofcertain novel details of construction and combinations of partshereinafter l fully described and claimed, it being understood thatvarious modifications may be resorted to Within the scope of theappended claims without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawing forming a part of this specification:

Figure 1 is a perspective view of a ply wood book cover showing thehinge leaf and clamp strip, constructed in accordance with theinvention.

Figure 2 is a longitudinal sectional View showing the p13r wood coverprovided with stepped recesses at the rear edge to receive the hingeleaf and clamp strip.

Figure 3 is a fragmentary cross sectional View taken on the line 3-3 ofFigure 1.

Figure 4 is a detail cross sectional view showing the ply wood coverhaving a bevel at the notched rear edge so that the clamp strip and leafare recessed below the surface of the covter.

Figure 5 is a plan view of the hinge leaf.

Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, IS! designates a bookcover formed of ply wood or similar material, preferably fabricated ofthree layers or plies. The rear longitudinal edge of the cover isprovided with stepped recesses iI and I2, the former being of a depthequal to the uppermost ply or layer, and

the latter being of a depth equal to about threefourths of the thicknessof the intermediate ply or layer, as best shown in Figure 2. A pluralityof openings I3 are formed in a longitudinal row and open through thelowermost step or recess I2 and through the bottom ply of the cover toreceive pins I4.

A metal hinge leaf I5 of the type used in the hinges of large ledgersand books, is received in the lowermost step or recess I2 and is ofsufficient thickness to be flush with the intermediate ply of the cover,as best shown in Figure 3. The hinge leaf is rolled upon itself at therear longitudinal edge to provide a tube I6 for receiving a hingepintle, not shown, the tube having notches I'I at intervals and havingextensions I8 at the ends to coact with the companion hinge structure ofconventional backs of large heavy volumes. The hinge leaf is providedwith a longitudinal row of openings I9 to receive the pins I4. A clampstrip 20 is superposed upon the hingeleaf and is of the same thicknessas the uppermost ply of the cover, and is of suiiicient width to ll thestep or recess II and overlap the hinge leaf. The rear longitudinal edgeof the clamp strip extends ush with the rear longitudinal edge of thecover. The clamp strip is provided with a longitudinal row of openings2l to receive the pins I4. The upper surface of the clamp strip extendsush with the upper surface of the uppermost ply of the cover so that theentire cover and hinge assembly is of uniform thickness throughout, asbest shown in Figures 1 and 3.

In Figure 4 is shown a modified form of the device in which theuppermost step or recess 22 is provided with a bevel 23 on thelongitudinal inner edge and the clamp strip 24 is only of sufcientthickness to extend with its top surface flush with the bottom of thebevel when received in the step or recess 22. Thus, the hinge portion ofthe cover is of less thickness than the remainder of the cover. Thisbeing the only difference between the modified form of the invention-andthe first described form of the invention, a description of the otherparts constituting the hinge need not be repeated.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplana tion.

What is claimed is:

1. In book covers, a cover member formed of y ply wood fabricated ofthree plies, the rear longitudinal edge being provided with a pair ofstepped recesses, one of the recesses being of a depth three plies, thethree longitudinal edges provided with a pair of stepped recesses, thecenter ply having a recess equal to about three fourths of the thicknessthereof, a metal hinge leaf received in the recess of the center ply andhaving its upper face flush with the upper face thereof, and a clampingstrip in the recess cf the upper ply and flush with the upper facethereof and overlapping the hinge leaf to the rear longitudinal 10 edgeof the lower ply,

MAYNARD R. HULTMAN. CARL E. HULTD/IAN

